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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: ReferenceFieldType.html 743 2015-01-28 21:39:47Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.core;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import java.util.Collections;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import java.util.Set;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.util.SortedSet;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import java.util.TreeSet;<a name="line.13"></a>
<span class="sourceLineNo">014</span><a name="line.14"></a>
<span class="sourceLineNo">015</span>import org.jsimpledb.util.ByteWriter;<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>/**<a name="line.17"></a>
<span class="sourceLineNo">018</span> * The {@link FieldType} for {@link ReferenceField}s. Instances support object type restriction.<a name="line.18"></a>
<span class="sourceLineNo">019</span> *<a name="line.19"></a>
<span class="sourceLineNo">020</span> * &lt;p&gt;<a name="line.20"></a>
<span class="sourceLineNo">021</span> * Null values are supported by this class.<a name="line.21"></a>
<span class="sourceLineNo">022</span> * &lt;/p&gt;<a name="line.22"></a>
<span class="sourceLineNo">023</span> */<a name="line.23"></a>
<span class="sourceLineNo">024</span>public class ReferenceFieldType extends NullSafeType&lt;ObjId&gt; {<a name="line.24"></a>
<span class="sourceLineNo">025</span><a name="line.25"></a>
<span class="sourceLineNo">026</span>    private final TreeSet&lt;Integer&gt; objectTypes;<a name="line.26"></a>
<span class="sourceLineNo">027</span><a name="line.27"></a>
<span class="sourceLineNo">028</span>    /**<a name="line.28"></a>
<span class="sourceLineNo">029</span>     * Constructor.<a name="line.29"></a>
<span class="sourceLineNo">030</span>     *<a name="line.30"></a>
<span class="sourceLineNo">031</span>     * &lt;p&gt;<a name="line.31"></a>
<span class="sourceLineNo">032</span>     * No restrictions will be placed on encoded references.<a name="line.32"></a>
<span class="sourceLineNo">033</span>     * &lt;/p&gt;<a name="line.33"></a>
<span class="sourceLineNo">034</span>     */<a name="line.34"></a>
<span class="sourceLineNo">035</span>    public ReferenceFieldType() {<a name="line.35"></a>
<span class="sourceLineNo">036</span>        this(null);<a name="line.36"></a>
<span class="sourceLineNo">037</span>    }<a name="line.37"></a>
<span class="sourceLineNo">038</span><a name="line.38"></a>
<span class="sourceLineNo">039</span>    /**<a name="line.39"></a>
<span class="sourceLineNo">040</span>     * Constructor.<a name="line.40"></a>
<span class="sourceLineNo">041</span>     *<a name="line.41"></a>
<span class="sourceLineNo">042</span>     * @param objectTypes allowed object type storage IDs, or null for no restriction<a name="line.42"></a>
<span class="sourceLineNo">043</span>     */<a name="line.43"></a>
<span class="sourceLineNo">044</span>    public ReferenceFieldType(Set&lt;Integer&gt; objectTypes) {<a name="line.44"></a>
<span class="sourceLineNo">045</span>        super(FieldType.REFERENCE_TYPE_NAME, FieldTypeRegistry.OBJ_ID);<a name="line.45"></a>
<span class="sourceLineNo">046</span>        this.objectTypes = objectTypes != null ? new TreeSet&lt;&gt;(objectTypes) : null;<a name="line.46"></a>
<span class="sourceLineNo">047</span>    }<a name="line.47"></a>
<span class="sourceLineNo">048</span><a name="line.48"></a>
<span class="sourceLineNo">049</span>    /**<a name="line.49"></a>
<span class="sourceLineNo">050</span>     * Get the object types this field type is allowed to reference, if so restricted.<a name="line.50"></a>
<span class="sourceLineNo">051</span>     *<a name="line.51"></a>
<span class="sourceLineNo">052</span>     * @return storage IDs of allowed object types, or null if there is no restriction<a name="line.52"></a>
<span class="sourceLineNo">053</span>     */<a name="line.53"></a>
<span class="sourceLineNo">054</span>    public SortedSet&lt;Integer&gt; getObjectTypes() {<a name="line.54"></a>
<span class="sourceLineNo">055</span>        return objectTypes != null ? Collections.unmodifiableSortedSet(this.objectTypes) : null;<a name="line.55"></a>
<span class="sourceLineNo">056</span>    }<a name="line.56"></a>
<span class="sourceLineNo">057</span><a name="line.57"></a>
<span class="sourceLineNo">058</span>// FieldType<a name="line.58"></a>
<span class="sourceLineNo">059</span><a name="line.59"></a>
<span class="sourceLineNo">060</span>    @Override<a name="line.60"></a>
<span class="sourceLineNo">061</span>    public void write(ByteWriter writer, ObjId id) {<a name="line.61"></a>
<span class="sourceLineNo">062</span>        super.write(writer, this.checkAllowed(id));<a name="line.62"></a>
<span class="sourceLineNo">063</span>    }<a name="line.63"></a>
<span class="sourceLineNo">064</span><a name="line.64"></a>
<span class="sourceLineNo">065</span>    @Override<a name="line.65"></a>
<span class="sourceLineNo">066</span>    public ObjId validate(Object obj) {<a name="line.66"></a>
<span class="sourceLineNo">067</span>        return this.checkAllowed(super.validate(obj));<a name="line.67"></a>
<span class="sourceLineNo">068</span>    }<a name="line.68"></a>
<span class="sourceLineNo">069</span><a name="line.69"></a>
<span class="sourceLineNo">070</span>    /**<a name="line.70"></a>
<span class="sourceLineNo">071</span>     * Verify the reference value is permitted by this instance.<a name="line.71"></a>
<span class="sourceLineNo">072</span>     *<a name="line.72"></a>
<span class="sourceLineNo">073</span>     * @param id reference value<a name="line.73"></a>
<span class="sourceLineNo">074</span>     * @return validated reference<a name="line.74"></a>
<span class="sourceLineNo">075</span>     * @throws InvalidReferenceException if {@code id} has a storage ID that is not allowed by this instance<a name="line.75"></a>
<span class="sourceLineNo">076</span>     */<a name="line.76"></a>
<span class="sourceLineNo">077</span>    protected ObjId checkAllowed(ObjId id) {<a name="line.77"></a>
<span class="sourceLineNo">078</span>        if (this.objectTypes != null &amp;&amp; id != null &amp;&amp; !this.objectTypes.contains(id.getStorageId()))<a name="line.78"></a>
<span class="sourceLineNo">079</span>            throw new InvalidReferenceException(id, this.objectTypes);<a name="line.79"></a>
<span class="sourceLineNo">080</span>        return id;<a name="line.80"></a>
<span class="sourceLineNo">081</span>    }<a name="line.81"></a>
<span class="sourceLineNo">082</span><a name="line.82"></a>
<span class="sourceLineNo">083</span>// Object<a name="line.83"></a>
<span class="sourceLineNo">084</span><a name="line.84"></a>
<span class="sourceLineNo">085</span>    @Override<a name="line.85"></a>
<span class="sourceLineNo">086</span>    public String toString() {<a name="line.86"></a>
<span class="sourceLineNo">087</span>        String desc = super.toString();<a name="line.87"></a>
<span class="sourceLineNo">088</span>        if (this.objectTypes != null)<a name="line.88"></a>
<span class="sourceLineNo">089</span>            desc += " to " + this.objectTypes;<a name="line.89"></a>
<span class="sourceLineNo">090</span>        return desc;<a name="line.90"></a>
<span class="sourceLineNo">091</span>    }<a name="line.91"></a>
<span class="sourceLineNo">092</span><a name="line.92"></a>
<span class="sourceLineNo">093</span>    @Override<a name="line.93"></a>
<span class="sourceLineNo">094</span>    public boolean equals(Object obj) {<a name="line.94"></a>
<span class="sourceLineNo">095</span>        if (obj == this)<a name="line.95"></a>
<span class="sourceLineNo">096</span>            return true;<a name="line.96"></a>
<span class="sourceLineNo">097</span>        if (!super.equals(obj))<a name="line.97"></a>
<span class="sourceLineNo">098</span>            return false;<a name="line.98"></a>
<span class="sourceLineNo">099</span>        final ReferenceFieldType that = (ReferenceFieldType)obj;<a name="line.99"></a>
<span class="sourceLineNo">100</span>        return this.objectTypes != null ? this.objectTypes.equals(that.objectTypes) : that.objectTypes == null;<a name="line.100"></a>
<span class="sourceLineNo">101</span>    }<a name="line.101"></a>
<span class="sourceLineNo">102</span><a name="line.102"></a>
<span class="sourceLineNo">103</span>    @Override<a name="line.103"></a>
<span class="sourceLineNo">104</span>    public int hashCode() {<a name="line.104"></a>
<span class="sourceLineNo">105</span>        return super.hashCode() ^ (this.objectTypes != null ? this.objectTypes.hashCode() : 0);<a name="line.105"></a>
<span class="sourceLineNo">106</span>    }<a name="line.106"></a>
<span class="sourceLineNo">107</span>}<a name="line.107"></a>
<span class="sourceLineNo">108</span><a name="line.108"></a>




























































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